| Name | Meaning | Details |
|---|---|---|
| Osbert | God Bright | View Details |
| Osborn | God Bear | View Details |
| Osbourne | God Bear | View Details |
| Oscosh | The Bravest Of All | View Details |
| Osgood | God Goth | View Details |
| Osiris | God Of The Dead | View Details |
| Osmond | God Protector | View Details |
| Osric | God Ruler | View Details |
| Osvaldo | God Rule | View Details |
| Oswald | God Rule | View Details |
| Oswaldo | God Rule | View Details |
| Othniel | Strength/Lion Of God | View Details |
| Overton | From The Riverbank Town | View Details |
| Owen | The Yew Tree Or Youth | View Details |
| Oxford | From The Oak Valley | View Details |